单项选择题

According to the passage, deep venous thrombosis usually happens to passengers in ______

A．first-class cabins
B．economy cabins
C．business cabins
D．all cabins

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单项选择题

Which of the following statements is NOT TRUE about the author

A．She feels hand-written letters are friendlier than word-processed ones.
B．She does not allow her children to send email thank-you note.
C．She thinks the best time to teach her children the basic etiquette of appreciation is to strike while the iron is still hot.
D．She thinks a thank-you note can make the gift giver feel special just as the recipient does.

单项选择题

In a ______ to further his knowledge of the unknown, man has begun to explore the outer space.

A．quest
B．denial
C．notion
D．insight

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